Evolution - Origin of Species 1. All present day species...

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Origin of Species 1. All present day species have descended from ancestral ones. Darwin used the word ‘Descent with Modification’ instead of evolution. 2. Natural Selection is the mechanism for evolution. Theory of Natural Selection 1. Overproduction: Populations of all species have the potential to produce offspring more than the environment can handle. This leads to struggle for existence. 2. Individual Variation: Individuals in a population vary in many heritable traits Inference: Differential reproductive success. Individuals with traits best suited to environment generally leave a large share of fertile surviving offspring. This leads to accumulation of favored traits in a population over generations- promotes evolutionary adaptations Evidence of Evolution 1. Fossil Records : Fossils are preserved remains or traces of organisms from the remote past. These are found in sedimentary rocks. Rivers carry soil, dirt and remains of organisms as they flow into the ocean. Over time more sedimentation
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Evolution - Origin of Species 1. All present day species...

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